• Title, Summary, Keyword: Feeding System

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Effect of Protein Feeding Systems for Egg-type Growing Pullets on Pullet Growth, Nutrient Consumption and Subsequent Laying Performance (난용계 육성기의 단백질 공급체계가 육성계의 성장 및 영양소 섭취량과 산란능력에 미치는 영향)

  • 이규호;정연종
    • Korean Journal of Poultry Science
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    • v.21 no.4
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    • pp.257-266
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    • 1994
  • Three protein feeding systems for egg-type pullets involving conventional step-down protein 18-15-12%), step-up protein(12-15-18%) and single-stage low protein (13-13-13%) with an iso-energy level of 2,900 ME kcal /kg were compared to examine the effect on pullet growth and subsequent laying performance. During the growing period, pullets subjected to the step-up and single-stage low protein feeding systems were lighter in body weight and consumed less feed and netabolizable energy than those on the conventional step-down protein feeding system(P<0.05). 3ut the pullets on the step-up protein diet consumed more protein, and those on the single-stage low protein diet consumed less protein than those on the step-down protein diet(P<0.05). Also, he feed cost was less in pullets on the single-stage low protein diet than in those on the other systems(P<0.05). During the laying period, sexual maturity was later in hens reared on the step-up and single-stage low protein diets than in those on the step-down protein diet(P<0.05), however, average hen-day egg production and egg weight were not significantly affected by the protein feeding systems in the growing period. Daily feed intake and feed required per egg were significantly reduced in hens on the single-stage low protein diet compared to those on conventional protein feeding system(P<0.05). It was concluded that the 13% single-stage low protein feeding system produced smaller pullets with less feed, energy, protein, and feed cost during the growing period, and hens reared on that system consumed less feed during the laying period without any impairment of production compared to the conventional rearing system.

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Dynamic Characteristic Analysis of KSR-III Propulsion Feeding System (KSR-III 추진기관 공급계 동특성 해석)

  • Jung, Young-Suk;Cho, In-Hyun;Jung, Tae-Kyu;Kwon, Oh-Sung
    • Proceedings of the KSME Conference
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    • pp.1008-1013
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    • 2001
  • KSR-III propulsion system designed in KARI has a gas-pressurization system for propellant feeding system. This system uses a regulator for the control of the ullage pressure of propellant tank and a venturi for passive control of propellant flowrate. This system seems to be very reliable, but the flowrate of propellant varies according to the change of acceleration with the rocket flight. In this paper, dynamic characteristic of KSR-III propulsion feeding system was analyzed in flight condition. The purpose of this research is to find the variation of off ratio and propellant flowrate change for certification condition of engine reliability test.

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A Study on the Overcurrent Relay Modeling and Protective Coordination for Overload in Domestic AC Electrical Railway System (국내 교류 전기철도 급전계통 보호용 과전류 계전기 모델링 및 과부하 보호 협조에 관한 연구)

  • Kim, Hyun-Dong;Cho, Gyu-Jung;Huh, Seung-Hoon;Kim, Chul-Hwan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.7
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    • pp.1121-1127
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    • 2016
  • In this paper, modeling of overcurrent relay(OCR) to protect domestic AC electric railway Auto Transformer(AT) feeding system and operation characteristic analysis on overload condition are described. The target system of this paper is actual site where overload trip of circuit breaker occurs frequently. Because this AT feeding system is made of parallel single track which had a load(electric train) respectively, and is connected with only T phase of Scott Transformer. In addition, this system has been feeding 66kV voltage by KEPCO, not 154kV. We focus on protective coordination of Scott Transformer primary side and secondary side OCR for Korea single track AC electrical railway system in operation currently. We modeled single track AT feeding system and OCR. Also we performed faults and overload analysis for verification of OCR's setting values and system modeling. To analyze above mentioned research, we used PSCAD/EMTDC software tool.

A Phase-shifter for Regulating Circulating Power Flow in a Parallel-feeding AC Traction Power System

  • Choi, Kyu-Hyoung
    • Journal of Electrical Engineering and Technology
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    • v.9 no.4
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    • pp.1137-1144
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    • 2014
  • A parallel-feeding AC traction power system increases the power supply capacity and decreases voltage fluctuations, but the circulating power flow caused by the phase difference between the traction substations prevents the system from being widely used. A circuit analysis shows that the circulating power flow increases almost linearly as the phase difference increases, which adds extra load to the system and results in increased power dissipation and load unbalance. In this paper, we suggest a phase shifter for the parallel-feeding AC traction power system. The phase shifter regulates the phase difference and the circulating power flow by injecting quadrature voltage which can be obtained directly from the Scott-connection transformer in the traction substation. A case study involving the phase shifter applied to the traction power system of a Korean high-speed rail system shows that a three-level phase shifter can prevent circulating power flow while the phase difference between substations increases up to 12 degrees, mitigate the load unbalance, and reduce power dissipation.

Vibration Control of a Drive Feeding System Using ER CD-ROM Mounts (ER CD-ROM 마운트를 이용한 드라이브 피딩 시스템의 진동 제어)

  • 최승복;김형규;임수철;박영필
    • Journal of KSNVE
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    • v.9 no.6
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    • pp.1247-1258
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    • 1999
  • This paper presents vibration control of a CD-ROM(compact disc-read only memory) drive feeding system consisting of a new type of CD-ROM mount using an electro-rheologocal(ER) fluid. Chemically treated starch particles and silicon oil are used for EF fluid, and its field-dependent yield stresses are experimentally distilled under both the shear and the flow modes. On the basis of the yield stress, an appropriate size of ER CD-ROM mount adapted to conventional feeding system is designed and manufactured. Vibration isolation performance of the proposed mount is evaluated in the frequency domain and compared with that of conventional rubber mount. The ER CD-ROM mount is then installed to the drive feeding system and the system equation of motion is derived. The skyhook controller is then incorporated with the fuzzy technique to improve the performance of ER CD-ROM mount. A set of fuzzy parameters and control rules are obtained from a relation between vertical displacement and pitching motion of the feedng system. Followingthe formulation of the fuzzy-skyhook controller, computer simulation is undertaken in order to evaluate vibration suppression of the CD-ROM drive feeding system subjected to various excitations.

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Performance Estimation of Feeding System for developing coaxial grinding system of light communicative ferrule (광통신용 페룰 가공을 위한 초미세 고기능 동축가공 연삭시스템용 이송계의 특성 평가)

  • Ahn K.J.;Choe B.O.;Lee H.J.;Hwang C.K.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.10-14
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    • 2005
  • This report deals with a feeding system of the Coaxal grinding machine, processing optical ferrule. This report also examines the applicability of using the feeding system for the Coaxial grinding machine, by mean of conducting performance estimation. The results are as follow; Repeatability of regulating wheel is $17{\mu}m$, R/W rotation accuracy is between $30\;\~\;40{\mu}m$. This means 'Rotation accuracy' is lower than the concentricity level. Backlash generation level at the feeding system of the grinding wheel is under $1{\mu}m$, thereby positioning accuracy is controlled within $2{\mu}m$ In terms of repeatability, you can find occasional error at the returning process from the starting point. This error is resulted from the measurement tolerance of the starting point sensor. We will get the repeatability level under control by $1{\mu}m$, through improving the soft-ware used and up-grading the sensor at the starting point.

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A Study on a Catenary Impedance Estimation Technique using Boosting Current Compensation Based on Current Division Characteristics of an AT Feeding System

  • Jung, Hosung;Kim, Hyungchul;Chang, Sang-Hoon;Kim, Joorak;Min, Myung-Hwan;An, Tae-Pung;Kwon, Sung-Il
    • Journal of Electrical Engineering and Technology
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    • v.10 no.3
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    • pp.1370-1376
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    • 2015
  • Generally, an autotransformer(AT) feeding system consists of double tracks, up and down, with the trolley wire and feeder wire of the up and down tracks connected in the sectioning post(SP). Consequently, load current or fault current flows on two tracks based on catenary impedance characteristics, making it difficult to estimate catenary impedance accurately. This paper presents a technique for the estimation of catenary impedance using boosting current compensation based on the current division characteristics of an AT feeding system to improve the operation performance of impedance relay. To verify the technique, we model an AT feeding system through a power analysis program (PSCAD/EMTDC) and simulate various operation and fault conditions. Through the simulation, we confirmed that the proposed technique has estimated catenary impedance with a similar degree of accuracy to the actual catenary impedance

Effects of Feeding System on Rumen Fermentation Parameters and Nutrient Digestibility in Holstein Steers

  • Li, D.Y.;Lee, Sang S.;Choi, N.J.;Lee, S.Y.;Sung, H.G.;Ko, J.Y.;Yun, S.G.;Ha, J.K.
    • Asian-Australasian Journal of Animal Sciences
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    • v.16 no.10
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    • pp.1482-1486
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    • 2003
  • In order to compare effects of feeding systems on rumen fermentation characteristics and nutrient digestion, steers were fed either total mixed ration (TMR) or separate concentrate-roughage ration (CR). Total tract digestibility of nutrients was higher in steers receiving TMR. Especially, DM, ADF and NDF in TMR were digested to a greater extent than those in CR. Rumen pH was not influenced by the feeding systems. Holstein steers on TMR had higher ruminal $NH_3$-N than those on CR. Feeding system did not alter VFA production but TMR feeding resulted in lower A/P ratio. TMR feeding tended to increase the number of bacteria and protozoa in the rumen fluid. Also steers fed TMR generally had higher fiber degrading enzyme activities, which might be the result of increased number of cellulolytic microbes in the rumen of animals on TMR. Our results indicate that TMR may provide more favorable condition for nutrient digestion both in the rumen and in the total tract of steers.

Location of Auto Transformer in AC AT Feeding System (교류 AT 급전계통에서의 단권변압기 설치위치의 최적화)

  • Han, M.S.;Lee, J.M.
    • Proceedings of the KIEE Conference
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    • pp.1248-1250
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    • 2002
  • AC AT feeding system is possible to do the long distance feeding due to compensate the voltage drop. Nowaday this is a typical and efficient type all over the world in high speed train and heavy transport capacity. Normally a Auto-transformer is installed at regular internal (5 to 10km) between Substation and Sectioning post, this study is reviewed the voltage drop according to train movement and the optimal location of auto transformer, and provided the efficient feeding configuration.

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A Study on Development of Press Brake by Data-based Servo Control System (데이터베이스를 이용한 서보제어방식의 절곡기 개발에 관한 연구)

  • 김경석;강기수;송충현;김성식
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.416-421
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    • 2002
  • The purpose of t his paper is to database each factors from experimental results and develop the servo-controlled feeding system on these database. At first, spring back and bending farce are analyzed by basic theory of bending processing. In database, through practical experiment by the expert various types of bending angel and thickness of plate are tested and classified with SB34P and Aluminum. For the development of servo-controlled feeding system, automatic feeding system is designed and manufactured with ball screw and LM guide and performance of the developed feeding system is tested under condition of standard machine tool examination. Also, Mechanical consideration of mainframe in press brake, development of controller based on NC, program for servo-control are studied. Finally, based on experimental data, the system is operated and compared with theoretical data

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